Apera Instruments AI311 PH60 Premium Waterproof Ph Pocket Tester, Replaceable Ph

Simply the best pocket ph. tester in the market for all kinds of regular ph. measurements, such as hydroponics, education, Tap/Drinking water, swimming pool, water treatment, etc. Up to 3 points of Auto calibration with Buffer recognition and 0 to 50c Auto temperature compensation (ATC), 0.01 ph., 0.5C accuracy with -2.00 to 16.00 ph. measuring range, Auto recognition and indication of stable values improves repeatability, saving you the trouble of guessing when to manually hold measurement (optional Auto hold function available). probe is replaceable, so you don't have to buy a whole new metre once the probe retires. Three types of replaceable probes for your choice, aiming at ph. measurement of variant substances (glass bulb probe for regular liquid testing, spear probe for food/semi-solid testing, surface probe for fabric/paper/skin testing). with an Ultra clear 180 viewing angle screen with 3 backlit colour (Blue for measuring mode, Green for calibration mode, red for warnings), it supports dual display of Temp./ph. value and indications of completed calibrations (where L/M/H indicate 3 points of calibrations) and stable readings (with a smiley face). easy menu setting, customising your tester according to your specific needs. SMART self-diagnosis, warning of out-of-range/preset measurement and incorrect calibrations. Comes with a complete Kit of premixed calibration solutions (4.00 and 7.00), storage solutions (3M KCl), AAA batteries, and a lanyard all in a portable carrying case. IP67 waterproof and dustproof, floats on water so you don't have to worry if dropped in water by accident. Longest 2000 hours' continuous operation (without backlit) powered by AAA batteries (with low power warning and Auto power off in 8 min if no operation).